High-voltage motor mica tape knowledge

The mica tape is the main insulation of the high-voltage motor coil. Today, we introduces you to several new types of mica tape. Let's take a look.

(1) High thermal conductivity mica tape and other high thermal conductivity insulating materials are important development directions in the future. Especially large-scale high-voltage motors and generators have urgent needs in this regard.

Advantages of high thermal conductivity mica tape: reduce the thickness of insulation, reduce temperature rise, and improve the overall economic and technical indicators of the motor. Compared with ordinary mica tape, the thermal conductivity of high thermal conductivity mica tape is increased by 2 times, the temperature rise can be increased by about 10 ℃, and the corresponding motor capacity can be increased by 10-15%; it is an ideal material for motors.

(2) Single-sided glass cloth reinforced silicone less adhesive tape is matched with silicone solvent-free impregnating paint. Good heat resistance, can reach 200 ~ 220 grade. Mainly used for high-power traction motors, nuclear power and other special motors.

(3) The porous air-permeable mica tape is a kind of glass cloth and non-woven fabric reinforced less adhesive tape, which can use polyester imide adhesive or epoxy adhesive. It has good breathability and can be adapted to high-voltage and ultra-high-voltage motor insulation. Since the insulation thickness of high-voltage and ultra-high-voltage motors is more than 3.0mm, in order to improve the effect of VPI dipping paint, higher requirements are placed on the ventilation performance of mica tape.

(4) The high mica content multi-tape is glass cloth reinforced multi-tape, which is suitable for molding or hydroforming process. Its outstanding feature is high mica content, mica content reaches nearly 60% (common multi-tape 5440-1 mica content is 40 %about). The high content of mica makes the mica tape and the insulating layer formed with higher electrical properties; it is mostly used for high-voltage motors and large-scale hydroelectric power generation.

(5) Single-sided polyester film reinforced tape with adhesive as polyester imine system, has high dielectric strength and excellent process performance, can be used with unsaturated polyester imide impregnating paint, epoxy impregnating paint Through the VPI process to obtain excellent performance insulation, is conducive to thinning the insulation thickness.